Trumpeter Vine Bush Leaves Are Shriveling And Falling Off

Q:My neighbor has two trumpeter vine bushes. One of them has leaves that are shriveling and falling off. I am sending a picture of it.

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The damage appears to be physical, as if someone or some thing stripped the branches. Is there an animal about, maybe trying to get to a bird nest or some other resident in the vine? That would be my best guess. Best Nancy